Mat fastener

A mat fastener for securing a mat to a support panel, comprising:

• a cylindrical main body having a central insertion hole defined therethrough, such that said cylindrical main body comprises a tubular body for receiving and passing therethrough a stud bolt projecting from said support panel;
• and engagement claws, projecting radially inwardly from inner peripheral surface portions of said tubular body defining said central insertion hole, for engaging said stud bolt;
• a retainer provided around a lower, outer peripheral portion of said main body and comprising a pair of upper and lower flange-like retaining members axially spaced apart with respect to each other by a distance which corresponds to the thickness of said mat to be fastened to said support panel, said lower retaining member having a guide notch, of a width greater than said thickness of said mat, extending radially inwardly from an outer peripheral portion of said lower retaining member;
• and
• radially outwardly extending operating means mounted upon upper, oppositely disposed, outer peripheral portions of said tubular body for rotating said main tubular body and said retainer such that said lower retaining member can be entirely disposed beneath said mat, whereby said mat is interposed between said upper and lower retaining members, after a peripheral edge portion of a hole of said mat has been inserted within said guide notch of said lower retaining member, and said tubular body and said retainer have been rotated substantially a complete turn by said radially outwardly extending operating means.